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1 | /* |
2 | * Cryptographic API. |
3 | * |
4 | * s390 generic implementation of the SHA Secure Hash Algorithms. |
5 | * |
6 | * Copyright IBM Corp. 2007 |
7 | * Author(s): Jan Glauber (jang@de.ibm.com) |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify it |
10 | * under the terms of the GNU General Public License as published by the Free |
11 | * Software Foundation; either version 2 of the License, or (at your option) |
12 | * any later version. |
13 | * |
14 | */ |
15 | |
16 | #include <crypto/internal/hash.h> |
17 | #include "sha.h" |
18 | #include "crypt_s390.h" |
19 | |
20 | int s390_sha_update(struct shash_desc *desc, const u8 *data, unsigned int len) |
21 | { |
22 | struct s390_sha_ctx *ctx = shash_desc_ctx(desc); |
23 | unsigned int bsize = crypto_shash_blocksize(desc->tfm); |
24 | unsigned int index; |
25 | int ret; |
26 | |
27 | /* how much is already in the buffer? */ |
28 | index = ctx->count & (bsize - 1); |
29 | ctx->count += len; |
30 | |
31 | if ((index + len) < bsize) |
32 | goto store; |
33 | |
34 | /* process one stored block */ |
35 | if (index) { |
36 | memcpy(ctx->buf + index, data, bsize - index); |
37 | ret = crypt_s390_kimd(ctx->func, ctx->state, ctx->buf, bsize); |
38 | BUG_ON(ret != bsize); |
39 | data += bsize - index; |
40 | len -= bsize - index; |
41 | } |
42 | |
43 | /* process as many blocks as possible */ |
44 | if (len >= bsize) { |
45 | ret = crypt_s390_kimd(ctx->func, ctx->state, data, |
46 | len & ~(bsize - 1)); |
47 | BUG_ON(ret != (len & ~(bsize - 1))); |
48 | data += ret; |
49 | len -= ret; |
50 | } |
51 | store: |
52 | if (len) |
53 | memcpy(ctx->buf + index , data, len); |
54 | |
55 | return 0; |
56 | } |
57 | EXPORT_SYMBOL_GPL(s390_sha_update); |
58 | |
59 | int s390_sha_final(struct shash_desc *desc, u8 *out) |
60 | { |
61 | struct s390_sha_ctx *ctx = shash_desc_ctx(desc); |
62 | unsigned int bsize = crypto_shash_blocksize(desc->tfm); |
63 | u64 bits; |
64 | unsigned int index, end, plen; |
65 | int ret; |
66 | |
67 | /* SHA-512 uses 128 bit padding length */ |
68 | plen = (bsize > SHA256_BLOCK_SIZE) ? 16 : 8; |
69 | |
70 | /* must perform manual padding */ |
71 | index = ctx->count & (bsize - 1); |
72 | end = (index < bsize - plen) ? bsize : (2 * bsize); |
73 | |
74 | /* start pad with 1 */ |
75 | ctx->buf[index] = 0x80; |
76 | index++; |
77 | |
78 | /* pad with zeros */ |
79 | memset(ctx->buf + index, 0x00, end - index - 8); |
80 | |
81 | /* |
82 | * Append message length. Well, SHA-512 wants a 128 bit length value, |
83 | * nevertheless we use u64, should be enough for now... |
84 | */ |
85 | bits = ctx->count * 8; |
86 | memcpy(ctx->buf + end - 8, &bits, sizeof(bits)); |
87 | |
88 | ret = crypt_s390_kimd(ctx->func, ctx->state, ctx->buf, end); |
89 | BUG_ON(ret != end); |
90 | |
91 | /* copy digest to out */ |
92 | memcpy(out, ctx->state, crypto_shash_digestsize(desc->tfm)); |
93 | /* wipe context */ |
94 | memset(ctx, 0, sizeof *ctx); |
95 | |
96 | return 0; |
97 | } |
98 | EXPORT_SYMBOL_GPL(s390_sha_final); |
99 | |
100 | MODULE_LICENSE("GPL"); |
101 | MODULE_DESCRIPTION("s390 SHA cipher common functions"); |
102 |
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